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  1. #1
    Senior Member dfischer1's Avatar
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    Mavic derailler -- 8 spd indexable?

    Anyone here have any experience using a Mavic derailleur with 8spd STI? I've looked around and can't find a real answer. Do I need a Shiftmate? Which one?

    Looking to see if I can put some new life into this:

  2. #2
    Senior Member canopus's Avatar
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    Is this a cassette? or a freewheel? What Brand? Do you have STI now or are you wanting to put STI on the bike? Do you have the parts laying around or were you going to buy them?

    Chances are good it isn't going to work with shimano STI levers but it depends on your cassette/freewheel.

    If you have a freewheel then I would recommend skipping this upgrade and just building with a new drivetrain to 9/10s with new wheels. An 8s freewheel wasn't long for this world when new and now are kinda like bigfoot. Also the indexes shifts wouldn't be real crisp.

    If you have a cassette and the parts on hand then assuming the cassette and shifters are matched, then you can always just try it. It may or may not work and last time I checked shiftmate didn't make anything for Mavic, so if it doesn't work just plan on a new RD. Not all that expensive in the general scheme of things.

    If you have to purchase all the parts then its another vote for just replacing the entire drive train, including hubs, for 9/10s.

    Or buying a new bike (n+1).
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  3. #3
    coprolite fietsbob's Avatar
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    I Have one if those , Mavic 851, it's much more efficient in motion, sideways,
    for cable pull than all the slant pantograph
    type derailleurs, that are all the current offerings.

    I use bar end friction shifters, on my bike. Campag 1012/3 to be specific

    If you envy indexing derailleur systems,
    I'd suggest you just buy into the whole index set,as a whole
    strip down the frame. and buy the entire groupset.

    and build it up with current index stuff ,
    [or buy a new bike, 8 speed is last century]

    or just learn how your elders won races over their entire careers,
    on friction shifted Derailleurs
    By developing the manual skills to shift the bike
    so as to use classic components.
    Last edited by fietsbob; 11-10-10 at 12:02 PM.

  4. #4
    Senior Member Chombi's Avatar
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    I don't think the Mavic 851 SSC RD was ever designed to work with indexed levers. It's the next, newer model (the 840) that did have the indexed feature. You can always experiment and see if the 851 will work with indexed levers, but it could be a long shot.
    I know that the 851 does work best with Mavic/Simplex retrofriction (non-indexed) levers though, as I have them on two bikes set up as such at seven speeds. Not sure if it has enough movement range to handle another speed though, as it feels close to being stretched at seven already

    Chombi
    Last edited by Chombi; 11-10-10 at 06:35 PM.

  5. #5
    Member Donzie's Avatar
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    I just discovered today (after twenty years of searching out this problem) that the 840's have *two* ways of running the cable: One, through a guidehole, for six speed cassettes; and another *around* that same guide, for seven and eight speeds. My 840, which indeed was indexed, never shifted properly, until I figured this out, as I could tweak it for one range or another, but not for both. So this one is perhaps not designed for index, as all that design was pretty specific.

    I would think that non-index saves you a world of problems, not the least of which was above. Also, because of the indexing issue, they were designed for Mavic shifters AND rear cassette. As I remember, when Mavic began to stop producing parts, they offered a free (what's it called?) freebody, to allow the cassette to accommodate Shimano. So, again, some pretty detailed stuff to work with non-Mavic stuff. Non-indexing should make things much simpler.

    Here's a great blog for Mavic interest: http://www.tearsforgears.com/2006/05...erailleur.html

  6. #6
    me have long head tube TallRider's Avatar
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    that rear derailer definitely looks pre-indexing. note that the Mavid RD that Donzie is talking about is the standard "slant paralellogram" design, not the type that the OP is asking about.

    To the OP: you'll need to do friction shifting, or just get a different rear derailer. Shimano index-compatible rear derailers are all over the place used, for cheap. There's no way (or VERY low likelihood) the derailer pictured will shift with a consistent throw across cogs.

  7. #7
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    Quote Originally Posted by fietsbob View Post
    I Have one if those , Mavic 851, it's much more efficient in motion, sideways,
    for cable pull than all the slant pantograph
    type derailleurs, that are all the current offerings.

    I use bar end friction shifters, on my bike. Campag 1012/3 to be specific

    If you envy indexing derailleur systems,
    I'd suggest you just buy into the whole index set,as a whole
    strip down the frame. and buy the entire groupset.

    and build it up with current index stuff ,
    [or buy a new bike, 8 speed is last century]

    or just learn how your elders won races over their entire careers,
    on friction shifted Derailleurs
    By developing the manual skills to shift the bike
    so as to use classic components.
    When Suntour developed the slant parallel-o-gram rear deraileur it spelled the end of the others because it was a better shifting system.

  8. #8
    Extra Medium Member redtires's Avatar
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    I ran those 851 SSC derailleurs for years...they're light, easily rebuilt, simple and very durable. But they aren't meant for indexing. Like someone stated previously, you could try it, but it would be a longshot. If you want a really cool, retro set-up...find yourself a pair of old Kronos carbon friction shifters!
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